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http://dx.doi.org/10.7854/JPSK.2019.28.2.53

Ductile Shear Deformation around Jirisan Area, Korea  

Ryoo, Chung-Ryul (Geology Division, Korea Institute of Geoscience and Mineral Resources)
Kang, Hee-Cheol (Department of Geological Sciences, Pusan National University)
Lee, Sang-Won (Department of Earth Science Education, Pusan National University)
Publication Information
The Journal of the Petrological Society of Korea / v.28, no.2, 2019 , pp. 53-69 More about this Journal
Abstract
In the Jirisan area of the Yeongnam Massif, Korea, several ductile shear zones are developed within Precambrian gneiss complex (Jirisan metamorphic rock complex). The ductile shear zones have a general NS- and NNE-striking foliation with westward dipping directions. The foliation developed in the shear zones cut the foliation in gneiss complex. The stretching lineations are well developed in the foliated plane of the shear zone, showing ENE-trend with gentle plunging angle to the ESE direction. Within shear zone, several millimetric to centimetric size of porphyroclasts are deformed strongly as a sigmoid form by ductile shearing. The sigmoid patterns of porphyroclasts in the shear zones indicate the dextral shearing. The spatial distribution of ductile shear zone is characterized by the dominant NS- and NNE-striking dextral sense in the central and eastern regions respectively. In the western part, it develops in NE-striking dextral sense which is the general direction of the Honam shear zone. The U-Pb concordant ages obtained from the two samples, the strongly sheared leucocratic gneiss, are $1,868{\pm}3.8Ma$ and $1,867{\pm}4.0Ma$, respectively, which are consistent with the U-Pb ages reported around the study area. We supposed that the ductile shearing in the study area is occurred about 230~220 Ma during late stage of the continental collision around Korea and is preceded by granitic intrusion related to subduction during 260~230 Ma, which are supported by compiling the age data from sheared gneiss, deformed mafic dyke intruded gneiss complex, and non-deformed igneous rocks.
Keywords
Jirisan; gneiss complex; ductile shear deformation; NS- and NNE-striking; stretching lineation; dextral shearing;
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Times Cited By KSCI : 6  (Citation Analysis)
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